Here's what Lawrence's hair color looked like before (at the Oscars in February):

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And here she is last night. Note how much cooler the undertones are here—not a warm, buttery blond strand in sight:

LAS VEGAS, NV - APRIL 12: Actress Jennifer Lawrence attends CinemaCon 2016 An Evening with Sony Pictures Entertainment: Celebrating the Summer of 2016 and Beyond at The Colosseum at Caesars Palace during CinemaCon, the official convention of the National Association of Theatre Owners, on April 12, 2016 in Las Vegas, Nevada. (Photo by Todd Williamson/Getty Images for CinemaCon)Todd Williamson/Getty Images

LAS VEGAS, NV - APRIL 12: Actress Jennifer Lawrence attends CinemaCon 2016 An Evening with Sony Pictures Entertainment: Celebrating the Summer of 2016 and Beyond at The Colosseum at Caesars Palace during CinemaCon, the official convention of the National Association of Theatre Owners, on April 12, 2016 in Las Vegas, Nevada. (Photo by Todd Williamson/Getty Images for CinemaCon)Todd Williamson/Getty Images

The colorist responsible for the look? You've definitely heard her name around these parts recently. It's celebrity hairstylist Riawna Capri, whose recent work on Julianne Hough and Emma Roberts also made us want to run to the salon. "I love, love, love icy blonds right now," she told Refinery29. "The paleness of the ice next to a darker brow is my favorite." She also stressed the importance of color-protecting products when you go for a tone this cool. "With all the purple shampoos out there, maintaining the icy hue is easier than ever," she said. Her favorite: Unite Blonda ($25, shop.unitehair.com).